Use chemical micro etching copper surface etching treatment (etch depth of 2-3 microns), the copper surface uneven micro-rough surface sink with active copper circuit board, but also to clean the surface of the copper oxide. To ensure there is a strong bond strength between the copper plating layer and a copper foil substrate. Conventional roughening treatment mainly persulfate or acidic copper chloride aqueous solution Microetch roughened. Now they use sulfuric acid sodium persulfate (H2SO4 / SPS) which etching rate is relatively constant, uniform coarsening effect. Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 layer multilayer professional providers, to provide customers with high-precision, high Shenzhen circuit board quality thick film printing copper circuit board, quality assurance, reasonable prices. It can prevent precipitation Cu (OH) 2 copper ions in alkaline solution. The degree of excess complexing agent of the bath bath deposition rate was less affected. Complexing agents for mixed potential and deposition current copper plating solution has an impact. Formaldehyde bath of formaldehyde 35% (by volume) of the content of 8ml / l or less copper circuit board, with its reduction potential to increase significantly the concentration of formaldehyde increases above 8ml / l, formaldehyde reduction potential increases slowly. In practice, the concentration of formaldehyde in the range of 10 ~ 15ml / l. Formaldehyde content vary within this range of concentrations Shen little effect on the deposition rate of copper circuit board copper, Guangdong copper circuit board, Newell Newell Chong Shenzhen Electronic Technology Co., Ltd. provided by. Shen copper circuit boards, Guangdong copper circuit board, Newell Year is the Year of the Shenzhen-Electronic Technology Co., Ltd. (www.yipcb.com) (www.yipcb.com) this year introduced a new upgrade, the above picture is for reference only, please You call Tel picture on this page or to obtain the latest information, contact: Huang Shengxing.